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The initialization and development of strain localization inside a triaxial sand specimen are affected by multiple factors (e.g., membrane stiffness, weak inclusions, particle breakage, slenderness ratio, etc.) To investigate the effect of membrane stiffness, a flexible membrane algorithm was implemented in the discrete element method code (PFC), which allowed both vertical and radial deformations of the specimen. The modeling results showed that the specimen failed with bulging in the middle portion (i.e., presented a barrel-like shape). In comparison with the rigid membrane algorithm, prominent shear bands could be spotted at microscopic scale for the flexible membrane bounded specimen. Weak inclusions and particle breakage were simulated by reducing particle stiffness and changing particle shape, and their effects on the triaxial sand specimens were examined. Analyses on the modeling results indicated that - in addition to the primary shear bands - both weak inclusions and particle breakage intrigued a secondary shear band and shear block while imposing no substantial effect on the stress-strain response of the specimens.
The initialization and development of strain localization inside a triaxial sand specimen are affected by multiple factors (e.g., membrane stiffness, weak inclusions, particle breakage, slenderness ratio, etc.) To investigate the effect of membrane stiffness, a flexible membrane algorithm was implemented in the discrete element method code (PFC), which allowed both vertical and radial deformations of the specimen. The modeling results showed that the specimen failed with bulging in the middle portion (i.e., presented a barrel-like shape). In comparison with the rigid membrane algorithm, prominent shear bands could be spotted at microscopic scale for the flexible membrane bounded specimen. Weak inclusions and particle breakage were simulated by reducing particle stiffness and changing particle shape, and their effects on the triaxial sand specimens were examined. Analyses on the modeling results indicated that - in addition to the primary shear bands - both weak inclusions and particle breakage intrigued a secondary shear band and shear block while imposing no substantial effect on the stress-strain response of the specimens.
Investigation of Influencing Factors on Strain Localization inside Sand Specimens Subjected to Triaxial Loading
Lu, Ye (author)
Second International Conference on Geotechnical and Earthquake Engineering ; 2013 ; Chengdu, China
IACGE 2013 ; 241-246
2013-10-09
Conference paper
Electronic Resource
English
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